Abstract: A method of providing wireless communication is disclosed. The method may include providing a number of stations configured for transmitting signals wirelessly over at least one channel and dividing the stations into at least two clusters. The stations within each cluster may operate cooperatively to transmit or receive signals corresponding to the cluster simultaneously.

Abstract: A wireless communication device is disclosed. The wireless communication device may include a first station and a second station. The first station is coupled with the second station. The first and second stations are within a first cluster. The stations within the first cluster are configured to operate cooperatively to transmit or receive signals corresponding to the cluster over at least one channel. One of the stations transmits only data signals without transmitting a preamble or a MAP message.

Abstract: A scheduling technique for wireless multihop relay communication systems is provided. With spatial separation caused by the shadowing effect of surrounding buildings, a base station and its relay stations in a single cell are divided into several groups by following the rule that stations with severe potential interference are separated into different groups. The base station arranges the scheduling of these groups and serves these groups sequentially in the time domain. To take advantage of shadow effect, the same radio resources can be scheduled for relay stations within the same group due to the isolation of interfering signals. In the present invention, base stations and relay stations are equipped with directional antennas or sector antennas to further exploit the advantage of spatial separations. Different relay groups can also reuse the radio resource through appropriate power control. The cell capacity can be enhanced substantially because of aggressive radio resource reuse.

Abstract: A scheduling technique for wireless multihop relay communication systems is provided. With spatial separation caused by the shadowing effect of surrounding buildings, a base station and its relay stations in a single cell are divided into several groups by following the rule that stations with severe potential interference are separated into different groups. The base station arranges the scheduling of these groups and serves these groups sequentially in the time domain. To take advantage of shadow effect, the same radio resources can be scheduled for relay stations within the same group due to the isolation of interfering signals. In the present invention, base stations and relay stations are equipped with directional antennas or sector antennas to further exploit the advantage of spatial separations. Different relay groups can also reuse the radio resource through appropriate power control. The cell capacity can be enhanced substantially because of aggressive radio resource reuse.

Abstract: A wireless communication device is disclosed. The wireless communication device may include a first station and a second station. The first station is coupled with the second station. The first and second stations are within a first cluster. The stations within the first cluster are configured to operate cooperatively to transmit or receive signals corresponding to the cluster over at least one channel.

Abstract: A method of providing wireless communication is disclosed. The method may include providing a number of stations configured for transmitting signals wirelessly over at least one channel and dividing the stations into at least two clusters. The stations within each cluster may operate cooperatively to transmit or receive signals corresponding to the cluster simultaneously.

Abstract: In the invention, a simple and robust method for clock offset compensation is proposed using an equalizer with time-varying signal windowing for which the timing information needed is obtained by an existing non-data-aided (NDA) timing estimator. Instead of interpolating the received signal, the proposed method compensates clock offset by using a moving signal window for equalizer. Since no interpolation is needed, the timing information required for the proposed method need not be so accurate as required for interpolation methods. Rather than the exact time drift due to clock offset, the proposed method requires only the timing points where the time drift accumulates to a pre-defined threshold. By applying an existing non-data-aided (NDA) timing estimator, the needed timing information can be obtained easily. Moreover, thanks to robustness of the NDA timing estimator, the proposed method is inherently robust and simple in implementation.

Abstract: A signal detection method with high detection probability and low false alarm rate is provided for spread spectrum communication systems. The method includes steps of a) receiving discrete-time input signal, b) converting the input signal into a correlator output signal with finite number of values, c) selecting a maximum value and a minimum value from the magnitude of values, respectively, d) dividing the maximum value by the minimum value for obtaining an enhanced peak value of the correlator output signal, and e) comparing the enhanced peak value of the correlator output signal with a predetermined threshold, wherein the input signal is detected as a spread spectrum signal if the enhanced peak value of the correlator output signal is greater than or equal to the predetermined threshold, whereas the input signal is not detected as a spread spectrum signal if the enhanced peak value of the correlator output signal is less than the predetermined threshold.